There are negative ions and positive ions known as anions and cations.
Atoms of elements (besides the noble gases) are not stable.
These atoms lose or gain electrons to gain the stable electronic configuration of a noble gas which has either 2 electrons or 8 electrons in the valence shell.
Since an atom is neutral, once it loses or gain electrons, it gains charge and is known as an ion
Answer:
2121 K
Explanation:
With the numbers given in the problem, this is the math.
Yes, Pb2+ react with KI.
Pb2+ is lead (II) ion
KI is a compound. It is a combination of potassium (K) and iodine (I). It is called potassium iodide.
Both potassium and iodine are highly reactive elements. Thus, when they are combined with another element like Pb2+, Pb2+ reacts with KI
The molecular mass of 
is: 1·1 + 1·14.01 + 2·16 = 47.01 g/mol.
Now we can convert the mass into mol of :
